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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . M E M O R Y --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2001-2009, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the default implementation of this package
+
+-- This implementation assumes that the underlying malloc/free/realloc
+-- implementation is thread safe, and thus, no additional lock is required.
+-- Note that we still need to defer abort because on most systems, an
+-- asynchronous signal (as used for implementing asynchronous abort of
+-- task) cannot safely be handled while malloc is executing.
+
+-- If you are not using Ada constructs containing the "abort" keyword, then
+-- you can remove the calls to Abort_Defer.all and Abort_Undefer.all from
+-- this unit.
+
+pragma Compiler_Unit;
+
+with Ada.Exceptions;
+with System.Soft_Links;
+with System.Parameters;
+with System.CRTL;
+
+package body System.Memory is
+
+ use Ada.Exceptions;
+ use System.Soft_Links;
+
+ function c_malloc (Size : System.CRTL.size_t) return System.Address
+ renames System.CRTL.malloc;
+
+ procedure c_free (Ptr : System.Address)
+ renames System.CRTL.free;
+
+ function c_realloc
+ (Ptr : System.Address; Size : System.CRTL.size_t) return System.Address
+ renames System.CRTL.realloc;
+
+ -----------
+ -- Alloc --
+ -----------
+
+ function Alloc (Size : size_t) return System.Address is
+ Result : System.Address;
+ Actual_Size : size_t := Size;
+
+ begin
+ if Size = size_t'Last then
+ Raise_Exception (Storage_Error'Identity, "object too large");
+ end if;
+
+ -- Change size from zero to non-zero. We still want a proper pointer
+ -- for the zero case because pointers to zero length objects have to
+ -- be distinct, but we can't just go ahead and allocate zero bytes,
+ -- since some malloc's return zero for a zero argument.
+
+ if Size = 0 then
+ Actual_Size := 1;
+ end if;
+
+ if Parameters.No_Abort then
+ Result := c_malloc (System.CRTL.size_t (Actual_Size));
+ else
+ Abort_Defer.all;
+ Result := c_malloc (System.CRTL.size_t (Actual_Size));
+ Abort_Undefer.all;
+ end if;
+
+ if Result = System.Null_Address then
+ Raise_Exception (Storage_Error'Identity, "heap exhausted");
+ end if;
+
+ return Result;
+ end Alloc;
+
+ ----------
+ -- Free --
+ ----------
+
+ procedure Free (Ptr : System.Address) is
+ begin
+ if Parameters.No_Abort then
+ c_free (Ptr);
+ else
+ Abort_Defer.all;
+ c_free (Ptr);
+ Abort_Undefer.all;
+ end if;
+ end Free;
+
+ -------------
+ -- Realloc --
+ -------------
+
+ function Realloc
+ (Ptr : System.Address;
+ Size : size_t)
+ return System.Address
+ is
+ Result : System.Address;
+ Actual_Size : constant size_t := Size;
+
+ begin
+ if Size = size_t'Last then
+ Raise_Exception (Storage_Error'Identity, "object too large");
+ end if;
+
+ if Parameters.No_Abort then
+ Result := c_realloc (Ptr, System.CRTL.size_t (Actual_Size));
+ else
+ Abort_Defer.all;
+ Result := c_realloc (Ptr, System.CRTL.size_t (Actual_Size));
+ Abort_Undefer.all;
+ end if;
+
+ if Result = System.Null_Address then
+ Raise_Exception (Storage_Error'Identity, "heap exhausted");
+ end if;
+
+ return Result;
+ end Realloc;
+
+end System.Memory;